Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[sfrench/cifs-2.6.git] / drivers / infiniband / ulp / ipoib / ipoib_main.c
1 /*
2  * Copyright (c) 2004 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
4  * Copyright (c) 2004 Voltaire, Inc. All rights reserved.
5  *
6  * This software is available to you under a choice of one of two
7  * licenses.  You may choose to be licensed under the terms of the GNU
8  * General Public License (GPL) Version 2, available from the file
9  * COPYING in the main directory of this source tree, or the
10  * OpenIB.org BSD license below:
11  *
12  *     Redistribution and use in source and binary forms, with or
13  *     without modification, are permitted provided that the following
14  *     conditions are met:
15  *
16  *      - Redistributions of source code must retain the above
17  *        copyright notice, this list of conditions and the following
18  *        disclaimer.
19  *
20  *      - Redistributions in binary form must reproduce the above
21  *        copyright notice, this list of conditions and the following
22  *        disclaimer in the documentation and/or other materials
23  *        provided with the distribution.
24  *
25  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
26  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
27  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
28  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
29  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
30  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
31  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
32  * SOFTWARE.
33  */
34
35 #include "ipoib.h"
36
37 #include <linux/module.h>
38
39 #include <linux/init.h>
40 #include <linux/slab.h>
41 #include <linux/kernel.h>
42 #include <linux/vmalloc.h>
43
44 #include <linux/if_arp.h>       /* For ARPHRD_xxx */
45
46 #include <linux/ip.h>
47 #include <linux/in.h>
48
49 #include <linux/jhash.h>
50 #include <net/arp.h>
51 #include <net/addrconf.h>
52 #include <linux/inetdevice.h>
53 #include <rdma/ib_cache.h>
54
55 #define DRV_VERSION "1.0.0"
56
57 const char ipoib_driver_version[] = DRV_VERSION;
58
59 MODULE_AUTHOR("Roland Dreier");
60 MODULE_DESCRIPTION("IP-over-InfiniBand net driver");
61 MODULE_LICENSE("Dual BSD/GPL");
62
63 int ipoib_sendq_size __read_mostly = IPOIB_TX_RING_SIZE;
64 int ipoib_recvq_size __read_mostly = IPOIB_RX_RING_SIZE;
65
66 module_param_named(send_queue_size, ipoib_sendq_size, int, 0444);
67 MODULE_PARM_DESC(send_queue_size, "Number of descriptors in send queue");
68 module_param_named(recv_queue_size, ipoib_recvq_size, int, 0444);
69 MODULE_PARM_DESC(recv_queue_size, "Number of descriptors in receive queue");
70
71 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
72 int ipoib_debug_level;
73
74 module_param_named(debug_level, ipoib_debug_level, int, 0644);
75 MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0");
76 #endif
77
78 struct ipoib_path_iter {
79         struct net_device *dev;
80         struct ipoib_path  path;
81 };
82
83 static const u8 ipv4_bcast_addr[] = {
84         0x00, 0xff, 0xff, 0xff,
85         0xff, 0x12, 0x40, 0x1b, 0x00, 0x00, 0x00, 0x00,
86         0x00, 0x00, 0x00, 0x00, 0xff, 0xff, 0xff, 0xff
87 };
88
89 struct workqueue_struct *ipoib_workqueue;
90
91 struct ib_sa_client ipoib_sa_client;
92
93 static void ipoib_add_one(struct ib_device *device);
94 static void ipoib_remove_one(struct ib_device *device, void *client_data);
95 static void ipoib_neigh_reclaim(struct rcu_head *rp);
96 static struct net_device *ipoib_get_net_dev_by_params(
97                 struct ib_device *dev, u8 port, u16 pkey,
98                 const union ib_gid *gid, const struct sockaddr *addr,
99                 void *client_data);
100 static int ipoib_set_mac(struct net_device *dev, void *addr);
101 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
102                        int cmd);
103
104 static struct ib_client ipoib_client = {
105         .name   = "ipoib",
106         .add    = ipoib_add_one,
107         .remove = ipoib_remove_one,
108         .get_net_dev_by_params = ipoib_get_net_dev_by_params,
109 };
110
111 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
112 static int ipoib_netdev_event(struct notifier_block *this,
113                               unsigned long event, void *ptr)
114 {
115         struct netdev_notifier_info *ni = ptr;
116         struct net_device *dev = ni->dev;
117
118         if (dev->netdev_ops->ndo_open != ipoib_open)
119                 return NOTIFY_DONE;
120
121         switch (event) {
122         case NETDEV_REGISTER:
123                 ipoib_create_debug_files(dev);
124                 break;
125         case NETDEV_CHANGENAME:
126                 ipoib_delete_debug_files(dev);
127                 ipoib_create_debug_files(dev);
128                 break;
129         case NETDEV_UNREGISTER:
130                 ipoib_delete_debug_files(dev);
131                 break;
132         }
133
134         return NOTIFY_DONE;
135 }
136 #endif
137
138 int ipoib_open(struct net_device *dev)
139 {
140         struct ipoib_dev_priv *priv = ipoib_priv(dev);
141
142         ipoib_dbg(priv, "bringing up interface\n");
143
144         netif_carrier_off(dev);
145
146         set_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
147
148         priv->sm_fullmember_sendonly_support = false;
149
150         if (ipoib_ib_dev_open(dev)) {
151                 if (!test_bit(IPOIB_PKEY_ASSIGNED, &priv->flags))
152                         return 0;
153                 goto err_disable;
154         }
155
156         ipoib_ib_dev_up(dev);
157
158         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
159                 struct ipoib_dev_priv *cpriv;
160
161                 /* Bring up any child interfaces too */
162                 down_read(&priv->vlan_rwsem);
163                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
164                         int flags;
165
166                         flags = cpriv->dev->flags;
167                         if (flags & IFF_UP)
168                                 continue;
169
170                         dev_change_flags(cpriv->dev, flags | IFF_UP, NULL);
171                 }
172                 up_read(&priv->vlan_rwsem);
173         }
174
175         netif_start_queue(dev);
176
177         return 0;
178
179 err_disable:
180         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
181
182         return -EINVAL;
183 }
184
185 static int ipoib_stop(struct net_device *dev)
186 {
187         struct ipoib_dev_priv *priv = ipoib_priv(dev);
188
189         ipoib_dbg(priv, "stopping interface\n");
190
191         clear_bit(IPOIB_FLAG_ADMIN_UP, &priv->flags);
192
193         netif_stop_queue(dev);
194
195         ipoib_ib_dev_down(dev);
196         ipoib_ib_dev_stop(dev);
197
198         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
199                 struct ipoib_dev_priv *cpriv;
200
201                 /* Bring down any child interfaces too */
202                 down_read(&priv->vlan_rwsem);
203                 list_for_each_entry(cpriv, &priv->child_intfs, list) {
204                         int flags;
205
206                         flags = cpriv->dev->flags;
207                         if (!(flags & IFF_UP))
208                                 continue;
209
210                         dev_change_flags(cpriv->dev, flags & ~IFF_UP, NULL);
211                 }
212                 up_read(&priv->vlan_rwsem);
213         }
214
215         return 0;
216 }
217
218 static netdev_features_t ipoib_fix_features(struct net_device *dev, netdev_features_t features)
219 {
220         struct ipoib_dev_priv *priv = ipoib_priv(dev);
221
222         if (test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags))
223                 features &= ~(NETIF_F_IP_CSUM | NETIF_F_TSO);
224
225         return features;
226 }
227
228 static int ipoib_change_mtu(struct net_device *dev, int new_mtu)
229 {
230         struct ipoib_dev_priv *priv = ipoib_priv(dev);
231         int ret = 0;
232
233         /* dev->mtu > 2K ==> connected mode */
234         if (ipoib_cm_admin_enabled(dev)) {
235                 if (new_mtu > ipoib_cm_max_mtu(dev))
236                         return -EINVAL;
237
238                 if (new_mtu > priv->mcast_mtu)
239                         ipoib_warn(priv, "mtu > %d will cause multicast packet drops.\n",
240                                    priv->mcast_mtu);
241
242                 dev->mtu = new_mtu;
243                 return 0;
244         }
245
246         if (new_mtu < (ETH_MIN_MTU + IPOIB_ENCAP_LEN) ||
247             new_mtu > IPOIB_UD_MTU(priv->max_ib_mtu))
248                 return -EINVAL;
249
250         priv->admin_mtu = new_mtu;
251
252         if (priv->mcast_mtu < priv->admin_mtu)
253                 ipoib_dbg(priv, "MTU must be smaller than the underlying "
254                                 "link layer MTU - 4 (%u)\n", priv->mcast_mtu);
255
256         new_mtu = min(priv->mcast_mtu, priv->admin_mtu);
257
258         if (priv->rn_ops->ndo_change_mtu) {
259                 bool carrier_status = netif_carrier_ok(dev);
260
261                 netif_carrier_off(dev);
262
263                 /* notify lower level on the real mtu */
264                 ret = priv->rn_ops->ndo_change_mtu(dev, new_mtu);
265
266                 if (carrier_status)
267                         netif_carrier_on(dev);
268         } else {
269                 dev->mtu = new_mtu;
270         }
271
272         return ret;
273 }
274
275 static void ipoib_get_stats(struct net_device *dev,
276                             struct rtnl_link_stats64 *stats)
277 {
278         struct ipoib_dev_priv *priv = ipoib_priv(dev);
279
280         if (priv->rn_ops->ndo_get_stats64)
281                 priv->rn_ops->ndo_get_stats64(dev, stats);
282         else
283                 netdev_stats_to_stats64(stats, &dev->stats);
284 }
285
286 /* Called with an RCU read lock taken */
287 static bool ipoib_is_dev_match_addr_rcu(const struct sockaddr *addr,
288                                         struct net_device *dev)
289 {
290         struct net *net = dev_net(dev);
291         struct in_device *in_dev;
292         struct sockaddr_in *addr_in = (struct sockaddr_in *)addr;
293         struct sockaddr_in6 *addr_in6 = (struct sockaddr_in6 *)addr;
294         __be32 ret_addr;
295
296         switch (addr->sa_family) {
297         case AF_INET:
298                 in_dev = in_dev_get(dev);
299                 if (!in_dev)
300                         return false;
301
302                 ret_addr = inet_confirm_addr(net, in_dev, 0,
303                                              addr_in->sin_addr.s_addr,
304                                              RT_SCOPE_HOST);
305                 in_dev_put(in_dev);
306                 if (ret_addr)
307                         return true;
308
309                 break;
310         case AF_INET6:
311                 if (IS_ENABLED(CONFIG_IPV6) &&
312                     ipv6_chk_addr(net, &addr_in6->sin6_addr, dev, 1))
313                         return true;
314
315                 break;
316         }
317         return false;
318 }
319
320 /**
321  * Find the master net_device on top of the given net_device.
322  * @dev: base IPoIB net_device
323  *
324  * Returns the master net_device with a reference held, or the same net_device
325  * if no master exists.
326  */
327 static struct net_device *ipoib_get_master_net_dev(struct net_device *dev)
328 {
329         struct net_device *master;
330
331         rcu_read_lock();
332         master = netdev_master_upper_dev_get_rcu(dev);
333         if (master)
334                 dev_hold(master);
335         rcu_read_unlock();
336
337         if (master)
338                 return master;
339
340         dev_hold(dev);
341         return dev;
342 }
343
344 struct ipoib_walk_data {
345         const struct sockaddr *addr;
346         struct net_device *result;
347 };
348
349 static int ipoib_upper_walk(struct net_device *upper, void *_data)
350 {
351         struct ipoib_walk_data *data = _data;
352         int ret = 0;
353
354         if (ipoib_is_dev_match_addr_rcu(data->addr, upper)) {
355                 dev_hold(upper);
356                 data->result = upper;
357                 ret = 1;
358         }
359
360         return ret;
361 }
362
363 /**
364  * Find a net_device matching the given address, which is an upper device of
365  * the given net_device.
366  * @addr: IP address to look for.
367  * @dev: base IPoIB net_device
368  *
369  * If found, returns the net_device with a reference held. Otherwise return
370  * NULL.
371  */
372 static struct net_device *ipoib_get_net_dev_match_addr(
373                 const struct sockaddr *addr, struct net_device *dev)
374 {
375         struct ipoib_walk_data data = {
376                 .addr = addr,
377         };
378
379         rcu_read_lock();
380         if (ipoib_is_dev_match_addr_rcu(addr, dev)) {
381                 dev_hold(dev);
382                 data.result = dev;
383                 goto out;
384         }
385
386         netdev_walk_all_upper_dev_rcu(dev, ipoib_upper_walk, &data);
387 out:
388         rcu_read_unlock();
389         return data.result;
390 }
391
392 /* returns the number of IPoIB netdevs on top a given ipoib device matching a
393  * pkey_index and address, if one exists.
394  *
395  * @found_net_dev: contains a matching net_device if the return value >= 1,
396  * with a reference held. */
397 static int ipoib_match_gid_pkey_addr(struct ipoib_dev_priv *priv,
398                                      const union ib_gid *gid,
399                                      u16 pkey_index,
400                                      const struct sockaddr *addr,
401                                      int nesting,
402                                      struct net_device **found_net_dev)
403 {
404         struct ipoib_dev_priv *child_priv;
405         struct net_device *net_dev = NULL;
406         int matches = 0;
407
408         if (priv->pkey_index == pkey_index &&
409             (!gid || !memcmp(gid, &priv->local_gid, sizeof(*gid)))) {
410                 if (!addr) {
411                         net_dev = ipoib_get_master_net_dev(priv->dev);
412                 } else {
413                         /* Verify the net_device matches the IP address, as
414                          * IPoIB child devices currently share a GID. */
415                         net_dev = ipoib_get_net_dev_match_addr(addr, priv->dev);
416                 }
417                 if (net_dev) {
418                         if (!*found_net_dev)
419                                 *found_net_dev = net_dev;
420                         else
421                                 dev_put(net_dev);
422                         ++matches;
423                 }
424         }
425
426         /* Check child interfaces */
427         down_read_nested(&priv->vlan_rwsem, nesting);
428         list_for_each_entry(child_priv, &priv->child_intfs, list) {
429                 matches += ipoib_match_gid_pkey_addr(child_priv, gid,
430                                                     pkey_index, addr,
431                                                     nesting + 1,
432                                                     found_net_dev);
433                 if (matches > 1)
434                         break;
435         }
436         up_read(&priv->vlan_rwsem);
437
438         return matches;
439 }
440
441 /* Returns the number of matching net_devs found (between 0 and 2). Also
442  * return the matching net_device in the @net_dev parameter, holding a
443  * reference to the net_device, if the number of matches >= 1 */
444 static int __ipoib_get_net_dev_by_params(struct list_head *dev_list, u8 port,
445                                          u16 pkey_index,
446                                          const union ib_gid *gid,
447                                          const struct sockaddr *addr,
448                                          struct net_device **net_dev)
449 {
450         struct ipoib_dev_priv *priv;
451         int matches = 0;
452
453         *net_dev = NULL;
454
455         list_for_each_entry(priv, dev_list, list) {
456                 if (priv->port != port)
457                         continue;
458
459                 matches += ipoib_match_gid_pkey_addr(priv, gid, pkey_index,
460                                                      addr, 0, net_dev);
461                 if (matches > 1)
462                         break;
463         }
464
465         return matches;
466 }
467
468 static struct net_device *ipoib_get_net_dev_by_params(
469                 struct ib_device *dev, u8 port, u16 pkey,
470                 const union ib_gid *gid, const struct sockaddr *addr,
471                 void *client_data)
472 {
473         struct net_device *net_dev;
474         struct list_head *dev_list = client_data;
475         u16 pkey_index;
476         int matches;
477         int ret;
478
479         if (!rdma_protocol_ib(dev, port))
480                 return NULL;
481
482         ret = ib_find_cached_pkey(dev, port, pkey, &pkey_index);
483         if (ret)
484                 return NULL;
485
486         if (!dev_list)
487                 return NULL;
488
489         /* See if we can find a unique device matching the L2 parameters */
490         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
491                                                 gid, NULL, &net_dev);
492
493         switch (matches) {
494         case 0:
495                 return NULL;
496         case 1:
497                 return net_dev;
498         }
499
500         dev_put(net_dev);
501
502         /* Couldn't find a unique device with L2 parameters only. Use L3
503          * address to uniquely match the net device */
504         matches = __ipoib_get_net_dev_by_params(dev_list, port, pkey_index,
505                                                 gid, addr, &net_dev);
506         switch (matches) {
507         case 0:
508                 return NULL;
509         default:
510                 dev_warn_ratelimited(&dev->dev,
511                                      "duplicate IP address detected\n");
512                 /* Fall through */
513         case 1:
514                 return net_dev;
515         }
516 }
517
518 int ipoib_set_mode(struct net_device *dev, const char *buf)
519 {
520         struct ipoib_dev_priv *priv = ipoib_priv(dev);
521
522         if ((test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
523              !strcmp(buf, "connected\n")) ||
524              (!test_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags) &&
525              !strcmp(buf, "datagram\n"))) {
526                 return 0;
527         }
528
529         /* flush paths if we switch modes so that connections are restarted */
530         if (IPOIB_CM_SUPPORTED(dev->dev_addr) && !strcmp(buf, "connected\n")) {
531                 set_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
532                 ipoib_warn(priv, "enabling connected mode "
533                            "will cause multicast packet drops\n");
534                 netdev_update_features(dev);
535                 dev_set_mtu(dev, ipoib_cm_max_mtu(dev));
536                 rtnl_unlock();
537                 priv->tx_wr.wr.send_flags &= ~IB_SEND_IP_CSUM;
538
539                 ipoib_flush_paths(dev);
540                 return (!rtnl_trylock()) ? -EBUSY : 0;
541         }
542
543         if (!strcmp(buf, "datagram\n")) {
544                 clear_bit(IPOIB_FLAG_ADMIN_CM, &priv->flags);
545                 netdev_update_features(dev);
546                 dev_set_mtu(dev, min(priv->mcast_mtu, dev->mtu));
547                 rtnl_unlock();
548                 ipoib_flush_paths(dev);
549                 return (!rtnl_trylock()) ? -EBUSY : 0;
550         }
551
552         return -EINVAL;
553 }
554
555 struct ipoib_path *__path_find(struct net_device *dev, void *gid)
556 {
557         struct ipoib_dev_priv *priv = ipoib_priv(dev);
558         struct rb_node *n = priv->path_tree.rb_node;
559         struct ipoib_path *path;
560         int ret;
561
562         while (n) {
563                 path = rb_entry(n, struct ipoib_path, rb_node);
564
565                 ret = memcmp(gid, path->pathrec.dgid.raw,
566                              sizeof (union ib_gid));
567
568                 if (ret < 0)
569                         n = n->rb_left;
570                 else if (ret > 0)
571                         n = n->rb_right;
572                 else
573                         return path;
574         }
575
576         return NULL;
577 }
578
579 static int __path_add(struct net_device *dev, struct ipoib_path *path)
580 {
581         struct ipoib_dev_priv *priv = ipoib_priv(dev);
582         struct rb_node **n = &priv->path_tree.rb_node;
583         struct rb_node *pn = NULL;
584         struct ipoib_path *tpath;
585         int ret;
586
587         while (*n) {
588                 pn = *n;
589                 tpath = rb_entry(pn, struct ipoib_path, rb_node);
590
591                 ret = memcmp(path->pathrec.dgid.raw, tpath->pathrec.dgid.raw,
592                              sizeof (union ib_gid));
593                 if (ret < 0)
594                         n = &pn->rb_left;
595                 else if (ret > 0)
596                         n = &pn->rb_right;
597                 else
598                         return -EEXIST;
599         }
600
601         rb_link_node(&path->rb_node, pn, n);
602         rb_insert_color(&path->rb_node, &priv->path_tree);
603
604         list_add_tail(&path->list, &priv->path_list);
605
606         return 0;
607 }
608
609 static void path_free(struct net_device *dev, struct ipoib_path *path)
610 {
611         struct sk_buff *skb;
612
613         while ((skb = __skb_dequeue(&path->queue)))
614                 dev_kfree_skb_irq(skb);
615
616         ipoib_dbg(ipoib_priv(dev), "%s\n", __func__);
617
618         /* remove all neigh connected to this path */
619         ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
620
621         if (path->ah)
622                 ipoib_put_ah(path->ah);
623
624         kfree(path);
625 }
626
627 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
628
629 struct ipoib_path_iter *ipoib_path_iter_init(struct net_device *dev)
630 {
631         struct ipoib_path_iter *iter;
632
633         iter = kmalloc(sizeof(*iter), GFP_KERNEL);
634         if (!iter)
635                 return NULL;
636
637         iter->dev = dev;
638         memset(iter->path.pathrec.dgid.raw, 0, 16);
639
640         if (ipoib_path_iter_next(iter)) {
641                 kfree(iter);
642                 return NULL;
643         }
644
645         return iter;
646 }
647
648 int ipoib_path_iter_next(struct ipoib_path_iter *iter)
649 {
650         struct ipoib_dev_priv *priv = ipoib_priv(iter->dev);
651         struct rb_node *n;
652         struct ipoib_path *path;
653         int ret = 1;
654
655         spin_lock_irq(&priv->lock);
656
657         n = rb_first(&priv->path_tree);
658
659         while (n) {
660                 path = rb_entry(n, struct ipoib_path, rb_node);
661
662                 if (memcmp(iter->path.pathrec.dgid.raw, path->pathrec.dgid.raw,
663                            sizeof (union ib_gid)) < 0) {
664                         iter->path = *path;
665                         ret = 0;
666                         break;
667                 }
668
669                 n = rb_next(n);
670         }
671
672         spin_unlock_irq(&priv->lock);
673
674         return ret;
675 }
676
677 void ipoib_path_iter_read(struct ipoib_path_iter *iter,
678                           struct ipoib_path *path)
679 {
680         *path = iter->path;
681 }
682
683 #endif /* CONFIG_INFINIBAND_IPOIB_DEBUG */
684
685 void ipoib_mark_paths_invalid(struct net_device *dev)
686 {
687         struct ipoib_dev_priv *priv = ipoib_priv(dev);
688         struct ipoib_path *path, *tp;
689
690         spin_lock_irq(&priv->lock);
691
692         list_for_each_entry_safe(path, tp, &priv->path_list, list) {
693                 ipoib_dbg(priv, "mark path LID 0x%08x GID %pI6 invalid\n",
694                           be32_to_cpu(sa_path_get_dlid(&path->pathrec)),
695                           path->pathrec.dgid.raw);
696                 if (path->ah)
697                         path->ah->valid = 0;
698         }
699
700         spin_unlock_irq(&priv->lock);
701 }
702
703 static void push_pseudo_header(struct sk_buff *skb, const char *daddr)
704 {
705         struct ipoib_pseudo_header *phdr;
706
707         phdr = skb_push(skb, sizeof(*phdr));
708         memcpy(phdr->hwaddr, daddr, INFINIBAND_ALEN);
709 }
710
711 void ipoib_flush_paths(struct net_device *dev)
712 {
713         struct ipoib_dev_priv *priv = ipoib_priv(dev);
714         struct ipoib_path *path, *tp;
715         LIST_HEAD(remove_list);
716         unsigned long flags;
717
718         netif_tx_lock_bh(dev);
719         spin_lock_irqsave(&priv->lock, flags);
720
721         list_splice_init(&priv->path_list, &remove_list);
722
723         list_for_each_entry(path, &remove_list, list)
724                 rb_erase(&path->rb_node, &priv->path_tree);
725
726         list_for_each_entry_safe(path, tp, &remove_list, list) {
727                 if (path->query)
728                         ib_sa_cancel_query(path->query_id, path->query);
729                 spin_unlock_irqrestore(&priv->lock, flags);
730                 netif_tx_unlock_bh(dev);
731                 wait_for_completion(&path->done);
732                 path_free(dev, path);
733                 netif_tx_lock_bh(dev);
734                 spin_lock_irqsave(&priv->lock, flags);
735         }
736
737         spin_unlock_irqrestore(&priv->lock, flags);
738         netif_tx_unlock_bh(dev);
739 }
740
741 static void path_rec_completion(int status,
742                                 struct sa_path_rec *pathrec,
743                                 void *path_ptr)
744 {
745         struct ipoib_path *path = path_ptr;
746         struct net_device *dev = path->dev;
747         struct ipoib_dev_priv *priv = ipoib_priv(dev);
748         struct ipoib_ah *ah = NULL;
749         struct ipoib_ah *old_ah = NULL;
750         struct ipoib_neigh *neigh, *tn;
751         struct sk_buff_head skqueue;
752         struct sk_buff *skb;
753         unsigned long flags;
754
755         if (!status)
756                 ipoib_dbg(priv, "PathRec LID 0x%04x for GID %pI6\n",
757                           be32_to_cpu(sa_path_get_dlid(pathrec)),
758                           pathrec->dgid.raw);
759         else
760                 ipoib_dbg(priv, "PathRec status %d for GID %pI6\n",
761                           status, path->pathrec.dgid.raw);
762
763         skb_queue_head_init(&skqueue);
764
765         if (!status) {
766                 struct rdma_ah_attr av;
767
768                 if (!ib_init_ah_attr_from_path(priv->ca, priv->port,
769                                                pathrec, &av, NULL)) {
770                         ah = ipoib_create_ah(dev, priv->pd, &av);
771                         rdma_destroy_ah_attr(&av);
772                 }
773         }
774
775         spin_lock_irqsave(&priv->lock, flags);
776
777         if (!IS_ERR_OR_NULL(ah)) {
778                 /*
779                  * pathrec.dgid is used as the database key from the LLADDR,
780                  * it must remain unchanged even if the SA returns a different
781                  * GID to use in the AH.
782                  */
783                 if (memcmp(pathrec->dgid.raw, path->pathrec.dgid.raw,
784                            sizeof(union ib_gid))) {
785                         ipoib_dbg(
786                                 priv,
787                                 "%s got PathRec for gid %pI6 while asked for %pI6\n",
788                                 dev->name, pathrec->dgid.raw,
789                                 path->pathrec.dgid.raw);
790                         memcpy(pathrec->dgid.raw, path->pathrec.dgid.raw,
791                                sizeof(union ib_gid));
792                 }
793
794                 path->pathrec = *pathrec;
795
796                 old_ah   = path->ah;
797                 path->ah = ah;
798
799                 ipoib_dbg(priv, "created address handle %p for LID 0x%04x, SL %d\n",
800                           ah, be32_to_cpu(sa_path_get_dlid(pathrec)),
801                           pathrec->sl);
802
803                 while ((skb = __skb_dequeue(&path->queue)))
804                         __skb_queue_tail(&skqueue, skb);
805
806                 list_for_each_entry_safe(neigh, tn, &path->neigh_list, list) {
807                         if (neigh->ah) {
808                                 WARN_ON(neigh->ah != old_ah);
809                                 /*
810                                  * Dropping the ah reference inside
811                                  * priv->lock is safe here, because we
812                                  * will hold one more reference from
813                                  * the original value of path->ah (ie
814                                  * old_ah).
815                                  */
816                                 ipoib_put_ah(neigh->ah);
817                         }
818                         kref_get(&path->ah->ref);
819                         neigh->ah = path->ah;
820
821                         if (ipoib_cm_enabled(dev, neigh->daddr)) {
822                                 if (!ipoib_cm_get(neigh))
823                                         ipoib_cm_set(neigh, ipoib_cm_create_tx(dev,
824                                                                                path,
825                                                                                neigh));
826                                 if (!ipoib_cm_get(neigh)) {
827                                         ipoib_neigh_free(neigh);
828                                         continue;
829                                 }
830                         }
831
832                         while ((skb = __skb_dequeue(&neigh->queue)))
833                                 __skb_queue_tail(&skqueue, skb);
834                 }
835                 path->ah->valid = 1;
836         }
837
838         path->query = NULL;
839         complete(&path->done);
840
841         spin_unlock_irqrestore(&priv->lock, flags);
842
843         if (IS_ERR_OR_NULL(ah))
844                 ipoib_del_neighs_by_gid(dev, path->pathrec.dgid.raw);
845
846         if (old_ah)
847                 ipoib_put_ah(old_ah);
848
849         while ((skb = __skb_dequeue(&skqueue))) {
850                 int ret;
851                 skb->dev = dev;
852                 ret = dev_queue_xmit(skb);
853                 if (ret)
854                         ipoib_warn(priv, "%s: dev_queue_xmit failed to re-queue packet, ret:%d\n",
855                                    __func__, ret);
856         }
857 }
858
859 static void init_path_rec(struct ipoib_dev_priv *priv, struct ipoib_path *path,
860                           void *gid)
861 {
862         path->dev = priv->dev;
863
864         if (rdma_cap_opa_ah(priv->ca, priv->port))
865                 path->pathrec.rec_type = SA_PATH_REC_TYPE_OPA;
866         else
867                 path->pathrec.rec_type = SA_PATH_REC_TYPE_IB;
868
869         memcpy(path->pathrec.dgid.raw, gid, sizeof(union ib_gid));
870         path->pathrec.sgid          = priv->local_gid;
871         path->pathrec.pkey          = cpu_to_be16(priv->pkey);
872         path->pathrec.numb_path     = 1;
873         path->pathrec.traffic_class = priv->broadcast->mcmember.traffic_class;
874 }
875
876 static struct ipoib_path *path_rec_create(struct net_device *dev, void *gid)
877 {
878         struct ipoib_dev_priv *priv = ipoib_priv(dev);
879         struct ipoib_path *path;
880
881         if (!priv->broadcast)
882                 return NULL;
883
884         path = kzalloc(sizeof(*path), GFP_ATOMIC);
885         if (!path)
886                 return NULL;
887
888         skb_queue_head_init(&path->queue);
889
890         INIT_LIST_HEAD(&path->neigh_list);
891
892         init_path_rec(priv, path, gid);
893
894         return path;
895 }
896
897 static int path_rec_start(struct net_device *dev,
898                           struct ipoib_path *path)
899 {
900         struct ipoib_dev_priv *priv = ipoib_priv(dev);
901
902         ipoib_dbg(priv, "Start path record lookup for %pI6\n",
903                   path->pathrec.dgid.raw);
904
905         init_completion(&path->done);
906
907         path->query_id =
908                 ib_sa_path_rec_get(&ipoib_sa_client, priv->ca, priv->port,
909                                    &path->pathrec,
910                                    IB_SA_PATH_REC_DGID          |
911                                    IB_SA_PATH_REC_SGID          |
912                                    IB_SA_PATH_REC_NUMB_PATH     |
913                                    IB_SA_PATH_REC_TRAFFIC_CLASS |
914                                    IB_SA_PATH_REC_PKEY,
915                                    1000, GFP_ATOMIC,
916                                    path_rec_completion,
917                                    path, &path->query);
918         if (path->query_id < 0) {
919                 ipoib_warn(priv, "ib_sa_path_rec_get failed: %d\n", path->query_id);
920                 path->query = NULL;
921                 complete(&path->done);
922                 return path->query_id;
923         }
924
925         return 0;
926 }
927
928 static void neigh_refresh_path(struct ipoib_neigh *neigh, u8 *daddr,
929                                struct net_device *dev)
930 {
931         struct ipoib_dev_priv *priv = ipoib_priv(dev);
932         struct ipoib_path *path;
933         unsigned long flags;
934
935         spin_lock_irqsave(&priv->lock, flags);
936
937         path = __path_find(dev, daddr + 4);
938         if (!path)
939                 goto out;
940         if (!path->query)
941                 path_rec_start(dev, path);
942 out:
943         spin_unlock_irqrestore(&priv->lock, flags);
944 }
945
946 static struct ipoib_neigh *neigh_add_path(struct sk_buff *skb, u8 *daddr,
947                                           struct net_device *dev)
948 {
949         struct ipoib_dev_priv *priv = ipoib_priv(dev);
950         struct rdma_netdev *rn = netdev_priv(dev);
951         struct ipoib_path *path;
952         struct ipoib_neigh *neigh;
953         unsigned long flags;
954
955         spin_lock_irqsave(&priv->lock, flags);
956         neigh = ipoib_neigh_alloc(daddr, dev);
957         if (!neigh) {
958                 spin_unlock_irqrestore(&priv->lock, flags);
959                 ++dev->stats.tx_dropped;
960                 dev_kfree_skb_any(skb);
961                 return NULL;
962         }
963
964         /* To avoid race condition, make sure that the
965          * neigh will be added only once.
966          */
967         if (unlikely(!list_empty(&neigh->list))) {
968                 spin_unlock_irqrestore(&priv->lock, flags);
969                 return neigh;
970         }
971
972         path = __path_find(dev, daddr + 4);
973         if (!path) {
974                 path = path_rec_create(dev, daddr + 4);
975                 if (!path)
976                         goto err_path;
977
978                 __path_add(dev, path);
979         }
980
981         list_add_tail(&neigh->list, &path->neigh_list);
982
983         if (path->ah && path->ah->valid) {
984                 kref_get(&path->ah->ref);
985                 neigh->ah = path->ah;
986
987                 if (ipoib_cm_enabled(dev, neigh->daddr)) {
988                         if (!ipoib_cm_get(neigh))
989                                 ipoib_cm_set(neigh, ipoib_cm_create_tx(dev, path, neigh));
990                         if (!ipoib_cm_get(neigh)) {
991                                 ipoib_neigh_free(neigh);
992                                 goto err_drop;
993                         }
994                         if (skb_queue_len(&neigh->queue) <
995                             IPOIB_MAX_PATH_REC_QUEUE) {
996                                 push_pseudo_header(skb, neigh->daddr);
997                                 __skb_queue_tail(&neigh->queue, skb);
998                         } else {
999                                 ipoib_warn(priv, "queue length limit %d. Packet drop.\n",
1000                                            skb_queue_len(&neigh->queue));
1001                                 goto err_drop;
1002                         }
1003                 } else {
1004                         spin_unlock_irqrestore(&priv->lock, flags);
1005                         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1006                                                        IPOIB_QPN(daddr));
1007                         ipoib_neigh_put(neigh);
1008                         return NULL;
1009                 }
1010         } else {
1011                 neigh->ah  = NULL;
1012
1013                 if (!path->query && path_rec_start(dev, path))
1014                         goto err_path;
1015                 if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1016                         push_pseudo_header(skb, neigh->daddr);
1017                         __skb_queue_tail(&neigh->queue, skb);
1018                 } else {
1019                         goto err_drop;
1020                 }
1021         }
1022
1023         spin_unlock_irqrestore(&priv->lock, flags);
1024         ipoib_neigh_put(neigh);
1025         return NULL;
1026
1027 err_path:
1028         ipoib_neigh_free(neigh);
1029 err_drop:
1030         ++dev->stats.tx_dropped;
1031         dev_kfree_skb_any(skb);
1032
1033         spin_unlock_irqrestore(&priv->lock, flags);
1034         ipoib_neigh_put(neigh);
1035
1036         return NULL;
1037 }
1038
1039 static void unicast_arp_send(struct sk_buff *skb, struct net_device *dev,
1040                              struct ipoib_pseudo_header *phdr)
1041 {
1042         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1043         struct rdma_netdev *rn = netdev_priv(dev);
1044         struct ipoib_path *path;
1045         unsigned long flags;
1046
1047         spin_lock_irqsave(&priv->lock, flags);
1048
1049         /* no broadcast means that all paths are (going to be) not valid */
1050         if (!priv->broadcast)
1051                 goto drop_and_unlock;
1052
1053         path = __path_find(dev, phdr->hwaddr + 4);
1054         if (!path || !path->ah || !path->ah->valid) {
1055                 if (!path) {
1056                         path = path_rec_create(dev, phdr->hwaddr + 4);
1057                         if (!path)
1058                                 goto drop_and_unlock;
1059                         __path_add(dev, path);
1060                 } else {
1061                         /*
1062                          * make sure there are no changes in the existing
1063                          * path record
1064                          */
1065                         init_path_rec(priv, path, phdr->hwaddr + 4);
1066                 }
1067                 if (!path->query && path_rec_start(dev, path)) {
1068                         goto drop_and_unlock;
1069                 }
1070
1071                 if (skb_queue_len(&path->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1072                         push_pseudo_header(skb, phdr->hwaddr);
1073                         __skb_queue_tail(&path->queue, skb);
1074                         goto unlock;
1075                 } else {
1076                         goto drop_and_unlock;
1077                 }
1078         }
1079
1080         spin_unlock_irqrestore(&priv->lock, flags);
1081         ipoib_dbg(priv, "Send unicast ARP to %08x\n",
1082                   be32_to_cpu(sa_path_get_dlid(&path->pathrec)));
1083         path->ah->last_send = rn->send(dev, skb, path->ah->ah,
1084                                        IPOIB_QPN(phdr->hwaddr));
1085         return;
1086
1087 drop_and_unlock:
1088         ++dev->stats.tx_dropped;
1089         dev_kfree_skb_any(skb);
1090 unlock:
1091         spin_unlock_irqrestore(&priv->lock, flags);
1092 }
1093
1094 static netdev_tx_t ipoib_start_xmit(struct sk_buff *skb, struct net_device *dev)
1095 {
1096         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1097         struct rdma_netdev *rn = netdev_priv(dev);
1098         struct ipoib_neigh *neigh;
1099         struct ipoib_pseudo_header *phdr;
1100         struct ipoib_header *header;
1101         unsigned long flags;
1102
1103         phdr = (struct ipoib_pseudo_header *) skb->data;
1104         skb_pull(skb, sizeof(*phdr));
1105         header = (struct ipoib_header *) skb->data;
1106
1107         if (unlikely(phdr->hwaddr[4] == 0xff)) {
1108                 /* multicast, arrange "if" according to probability */
1109                 if ((header->proto != htons(ETH_P_IP)) &&
1110                     (header->proto != htons(ETH_P_IPV6)) &&
1111                     (header->proto != htons(ETH_P_ARP)) &&
1112                     (header->proto != htons(ETH_P_RARP)) &&
1113                     (header->proto != htons(ETH_P_TIPC))) {
1114                         /* ethertype not supported by IPoIB */
1115                         ++dev->stats.tx_dropped;
1116                         dev_kfree_skb_any(skb);
1117                         return NETDEV_TX_OK;
1118                 }
1119                 /* Add in the P_Key for multicast*/
1120                 phdr->hwaddr[8] = (priv->pkey >> 8) & 0xff;
1121                 phdr->hwaddr[9] = priv->pkey & 0xff;
1122
1123                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1124                 if (likely(neigh))
1125                         goto send_using_neigh;
1126                 ipoib_mcast_send(dev, phdr->hwaddr, skb);
1127                 return NETDEV_TX_OK;
1128         }
1129
1130         /* unicast, arrange "switch" according to probability */
1131         switch (header->proto) {
1132         case htons(ETH_P_IP):
1133         case htons(ETH_P_IPV6):
1134         case htons(ETH_P_TIPC):
1135                 neigh = ipoib_neigh_get(dev, phdr->hwaddr);
1136                 if (unlikely(!neigh)) {
1137                         neigh = neigh_add_path(skb, phdr->hwaddr, dev);
1138                         if (likely(!neigh))
1139                                 return NETDEV_TX_OK;
1140                 }
1141                 break;
1142         case htons(ETH_P_ARP):
1143         case htons(ETH_P_RARP):
1144                 /* for unicast ARP and RARP should always perform path find */
1145                 unicast_arp_send(skb, dev, phdr);
1146                 return NETDEV_TX_OK;
1147         default:
1148                 /* ethertype not supported by IPoIB */
1149                 ++dev->stats.tx_dropped;
1150                 dev_kfree_skb_any(skb);
1151                 return NETDEV_TX_OK;
1152         }
1153
1154 send_using_neigh:
1155         /* note we now hold a ref to neigh */
1156         if (ipoib_cm_get(neigh)) {
1157                 if (ipoib_cm_up(neigh)) {
1158                         ipoib_cm_send(dev, skb, ipoib_cm_get(neigh));
1159                         goto unref;
1160                 }
1161         } else if (neigh->ah && neigh->ah->valid) {
1162                 neigh->ah->last_send = rn->send(dev, skb, neigh->ah->ah,
1163                                                 IPOIB_QPN(phdr->hwaddr));
1164                 goto unref;
1165         } else if (neigh->ah) {
1166                 neigh_refresh_path(neigh, phdr->hwaddr, dev);
1167         }
1168
1169         if (skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE) {
1170                 push_pseudo_header(skb, phdr->hwaddr);
1171                 spin_lock_irqsave(&priv->lock, flags);
1172                 __skb_queue_tail(&neigh->queue, skb);
1173                 spin_unlock_irqrestore(&priv->lock, flags);
1174         } else {
1175                 ++dev->stats.tx_dropped;
1176                 dev_kfree_skb_any(skb);
1177         }
1178
1179 unref:
1180         ipoib_neigh_put(neigh);
1181
1182         return NETDEV_TX_OK;
1183 }
1184
1185 static void ipoib_timeout(struct net_device *dev)
1186 {
1187         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1188
1189         ipoib_warn(priv, "transmit timeout: latency %d msecs\n",
1190                    jiffies_to_msecs(jiffies - dev_trans_start(dev)));
1191         ipoib_warn(priv, "queue stopped %d, tx_head %u, tx_tail %u\n",
1192                    netif_queue_stopped(dev),
1193                    priv->tx_head, priv->tx_tail);
1194         /* XXX reset QP, etc. */
1195 }
1196
1197 static int ipoib_hard_header(struct sk_buff *skb,
1198                              struct net_device *dev,
1199                              unsigned short type,
1200                              const void *daddr,
1201                              const void *saddr,
1202                              unsigned int len)
1203 {
1204         struct ipoib_header *header;
1205
1206         header = skb_push(skb, sizeof(*header));
1207
1208         header->proto = htons(type);
1209         header->reserved = 0;
1210
1211         /*
1212          * we don't rely on dst_entry structure,  always stuff the
1213          * destination address into skb hard header so we can figure out where
1214          * to send the packet later.
1215          */
1216         push_pseudo_header(skb, daddr);
1217
1218         return IPOIB_HARD_LEN;
1219 }
1220
1221 static void ipoib_set_mcast_list(struct net_device *dev)
1222 {
1223         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1224
1225         if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags)) {
1226                 ipoib_dbg(priv, "IPOIB_FLAG_OPER_UP not set");
1227                 return;
1228         }
1229
1230         queue_work(priv->wq, &priv->restart_task);
1231 }
1232
1233 static int ipoib_get_iflink(const struct net_device *dev)
1234 {
1235         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1236
1237         /* parent interface */
1238         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
1239                 return dev->ifindex;
1240
1241         /* child/vlan interface */
1242         return priv->parent->ifindex;
1243 }
1244
1245 static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
1246 {
1247         /*
1248          * Use only the address parts that contributes to spreading
1249          * The subnet prefix is not used as one can not connect to
1250          * same remote port (GUID) using the same remote QPN via two
1251          * different subnets.
1252          */
1253          /* qpn octets[1:4) & port GUID octets[12:20) */
1254         u32 *d32 = (u32 *) daddr;
1255         u32 hv;
1256
1257         hv = jhash_3words(d32[3], d32[4], IPOIB_QPN_MASK & d32[0], 0);
1258         return hv & htbl->mask;
1259 }
1260
1261 struct ipoib_neigh *ipoib_neigh_get(struct net_device *dev, u8 *daddr)
1262 {
1263         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1264         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1265         struct ipoib_neigh_hash *htbl;
1266         struct ipoib_neigh *neigh = NULL;
1267         u32 hash_val;
1268
1269         rcu_read_lock_bh();
1270
1271         htbl = rcu_dereference_bh(ntbl->htbl);
1272
1273         if (!htbl)
1274                 goto out_unlock;
1275
1276         hash_val = ipoib_addr_hash(htbl, daddr);
1277         for (neigh = rcu_dereference_bh(htbl->buckets[hash_val]);
1278              neigh != NULL;
1279              neigh = rcu_dereference_bh(neigh->hnext)) {
1280                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1281                         /* found, take one ref on behalf of the caller */
1282                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1283                                 /* deleted */
1284                                 neigh = NULL;
1285                                 goto out_unlock;
1286                         }
1287
1288                         if (likely(skb_queue_len(&neigh->queue) < IPOIB_MAX_PATH_REC_QUEUE))
1289                                 neigh->alive = jiffies;
1290                         goto out_unlock;
1291                 }
1292         }
1293
1294 out_unlock:
1295         rcu_read_unlock_bh();
1296         return neigh;
1297 }
1298
1299 static void __ipoib_reap_neigh(struct ipoib_dev_priv *priv)
1300 {
1301         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1302         struct ipoib_neigh_hash *htbl;
1303         unsigned long neigh_obsolete;
1304         unsigned long dt;
1305         unsigned long flags;
1306         int i;
1307         LIST_HEAD(remove_list);
1308
1309         spin_lock_irqsave(&priv->lock, flags);
1310
1311         htbl = rcu_dereference_protected(ntbl->htbl,
1312                                          lockdep_is_held(&priv->lock));
1313
1314         if (!htbl)
1315                 goto out_unlock;
1316
1317         /* neigh is obsolete if it was idle for two GC periods */
1318         dt = 2 * arp_tbl.gc_interval;
1319         neigh_obsolete = jiffies - dt;
1320
1321         for (i = 0; i < htbl->size; i++) {
1322                 struct ipoib_neigh *neigh;
1323                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1324
1325                 while ((neigh = rcu_dereference_protected(*np,
1326                                                           lockdep_is_held(&priv->lock))) != NULL) {
1327                         /* was the neigh idle for two GC periods */
1328                         if (time_after(neigh_obsolete, neigh->alive)) {
1329
1330                                 ipoib_check_and_add_mcast_sendonly(priv, neigh->daddr + 4, &remove_list);
1331
1332                                 rcu_assign_pointer(*np,
1333                                                    rcu_dereference_protected(neigh->hnext,
1334                                                                              lockdep_is_held(&priv->lock)));
1335                                 /* remove from path/mc list */
1336                                 list_del_init(&neigh->list);
1337                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1338                         } else {
1339                                 np = &neigh->hnext;
1340                         }
1341
1342                 }
1343         }
1344
1345 out_unlock:
1346         spin_unlock_irqrestore(&priv->lock, flags);
1347         ipoib_mcast_remove_list(&remove_list);
1348 }
1349
1350 static void ipoib_reap_neigh(struct work_struct *work)
1351 {
1352         struct ipoib_dev_priv *priv =
1353                 container_of(work, struct ipoib_dev_priv, neigh_reap_task.work);
1354
1355         __ipoib_reap_neigh(priv);
1356
1357         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1358                            arp_tbl.gc_interval);
1359 }
1360
1361
1362 static struct ipoib_neigh *ipoib_neigh_ctor(u8 *daddr,
1363                                       struct net_device *dev)
1364 {
1365         struct ipoib_neigh *neigh;
1366
1367         neigh = kzalloc(sizeof(*neigh), GFP_ATOMIC);
1368         if (!neigh)
1369                 return NULL;
1370
1371         neigh->dev = dev;
1372         memcpy(&neigh->daddr, daddr, sizeof(neigh->daddr));
1373         skb_queue_head_init(&neigh->queue);
1374         INIT_LIST_HEAD(&neigh->list);
1375         ipoib_cm_set(neigh, NULL);
1376         /* one ref on behalf of the caller */
1377         atomic_set(&neigh->refcnt, 1);
1378
1379         return neigh;
1380 }
1381
1382 struct ipoib_neigh *ipoib_neigh_alloc(u8 *daddr,
1383                                       struct net_device *dev)
1384 {
1385         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1386         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1387         struct ipoib_neigh_hash *htbl;
1388         struct ipoib_neigh *neigh;
1389         u32 hash_val;
1390
1391         htbl = rcu_dereference_protected(ntbl->htbl,
1392                                          lockdep_is_held(&priv->lock));
1393         if (!htbl) {
1394                 neigh = NULL;
1395                 goto out_unlock;
1396         }
1397
1398         /* need to add a new neigh, but maybe some other thread succeeded?
1399          * recalc hash, maybe hash resize took place so we do a search
1400          */
1401         hash_val = ipoib_addr_hash(htbl, daddr);
1402         for (neigh = rcu_dereference_protected(htbl->buckets[hash_val],
1403                                                lockdep_is_held(&priv->lock));
1404              neigh != NULL;
1405              neigh = rcu_dereference_protected(neigh->hnext,
1406                                                lockdep_is_held(&priv->lock))) {
1407                 if (memcmp(daddr, neigh->daddr, INFINIBAND_ALEN) == 0) {
1408                         /* found, take one ref on behalf of the caller */
1409                         if (!atomic_inc_not_zero(&neigh->refcnt)) {
1410                                 /* deleted */
1411                                 neigh = NULL;
1412                                 break;
1413                         }
1414                         neigh->alive = jiffies;
1415                         goto out_unlock;
1416                 }
1417         }
1418
1419         neigh = ipoib_neigh_ctor(daddr, dev);
1420         if (!neigh)
1421                 goto out_unlock;
1422
1423         /* one ref on behalf of the hash table */
1424         atomic_inc(&neigh->refcnt);
1425         neigh->alive = jiffies;
1426         /* put in hash */
1427         rcu_assign_pointer(neigh->hnext,
1428                            rcu_dereference_protected(htbl->buckets[hash_val],
1429                                                      lockdep_is_held(&priv->lock)));
1430         rcu_assign_pointer(htbl->buckets[hash_val], neigh);
1431         atomic_inc(&ntbl->entries);
1432
1433 out_unlock:
1434
1435         return neigh;
1436 }
1437
1438 void ipoib_neigh_dtor(struct ipoib_neigh *neigh)
1439 {
1440         /* neigh reference count was dropprd to zero */
1441         struct net_device *dev = neigh->dev;
1442         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1443         struct sk_buff *skb;
1444         if (neigh->ah)
1445                 ipoib_put_ah(neigh->ah);
1446         while ((skb = __skb_dequeue(&neigh->queue))) {
1447                 ++dev->stats.tx_dropped;
1448                 dev_kfree_skb_any(skb);
1449         }
1450         if (ipoib_cm_get(neigh))
1451                 ipoib_cm_destroy_tx(ipoib_cm_get(neigh));
1452         ipoib_dbg(ipoib_priv(dev),
1453                   "neigh free for %06x %pI6\n",
1454                   IPOIB_QPN(neigh->daddr),
1455                   neigh->daddr + 4);
1456         kfree(neigh);
1457         if (atomic_dec_and_test(&priv->ntbl.entries)) {
1458                 if (test_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags))
1459                         complete(&priv->ntbl.flushed);
1460         }
1461 }
1462
1463 static void ipoib_neigh_reclaim(struct rcu_head *rp)
1464 {
1465         /* Called as a result of removal from hash table */
1466         struct ipoib_neigh *neigh = container_of(rp, struct ipoib_neigh, rcu);
1467         /* note TX context may hold another ref */
1468         ipoib_neigh_put(neigh);
1469 }
1470
1471 void ipoib_neigh_free(struct ipoib_neigh *neigh)
1472 {
1473         struct net_device *dev = neigh->dev;
1474         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1475         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1476         struct ipoib_neigh_hash *htbl;
1477         struct ipoib_neigh __rcu **np;
1478         struct ipoib_neigh *n;
1479         u32 hash_val;
1480
1481         htbl = rcu_dereference_protected(ntbl->htbl,
1482                                         lockdep_is_held(&priv->lock));
1483         if (!htbl)
1484                 return;
1485
1486         hash_val = ipoib_addr_hash(htbl, neigh->daddr);
1487         np = &htbl->buckets[hash_val];
1488         for (n = rcu_dereference_protected(*np,
1489                                             lockdep_is_held(&priv->lock));
1490              n != NULL;
1491              n = rcu_dereference_protected(*np,
1492                                         lockdep_is_held(&priv->lock))) {
1493                 if (n == neigh) {
1494                         /* found */
1495                         rcu_assign_pointer(*np,
1496                                            rcu_dereference_protected(neigh->hnext,
1497                                                                      lockdep_is_held(&priv->lock)));
1498                         /* remove from parent list */
1499                         list_del_init(&neigh->list);
1500                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1501                         return;
1502                 } else {
1503                         np = &n->hnext;
1504                 }
1505         }
1506 }
1507
1508 static int ipoib_neigh_hash_init(struct ipoib_dev_priv *priv)
1509 {
1510         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1511         struct ipoib_neigh_hash *htbl;
1512         struct ipoib_neigh __rcu **buckets;
1513         u32 size;
1514
1515         clear_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1516         ntbl->htbl = NULL;
1517         htbl = kzalloc(sizeof(*htbl), GFP_KERNEL);
1518         if (!htbl)
1519                 return -ENOMEM;
1520         size = roundup_pow_of_two(arp_tbl.gc_thresh3);
1521         buckets = kvcalloc(size, sizeof(*buckets), GFP_KERNEL);
1522         if (!buckets) {
1523                 kfree(htbl);
1524                 return -ENOMEM;
1525         }
1526         htbl->size = size;
1527         htbl->mask = (size - 1);
1528         htbl->buckets = buckets;
1529         RCU_INIT_POINTER(ntbl->htbl, htbl);
1530         htbl->ntbl = ntbl;
1531         atomic_set(&ntbl->entries, 0);
1532
1533         /* start garbage collection */
1534         queue_delayed_work(priv->wq, &priv->neigh_reap_task,
1535                            arp_tbl.gc_interval);
1536
1537         return 0;
1538 }
1539
1540 static void neigh_hash_free_rcu(struct rcu_head *head)
1541 {
1542         struct ipoib_neigh_hash *htbl = container_of(head,
1543                                                     struct ipoib_neigh_hash,
1544                                                     rcu);
1545         struct ipoib_neigh __rcu **buckets = htbl->buckets;
1546         struct ipoib_neigh_table *ntbl = htbl->ntbl;
1547
1548         kvfree(buckets);
1549         kfree(htbl);
1550         complete(&ntbl->deleted);
1551 }
1552
1553 void ipoib_del_neighs_by_gid(struct net_device *dev, u8 *gid)
1554 {
1555         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1556         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1557         struct ipoib_neigh_hash *htbl;
1558         unsigned long flags;
1559         int i;
1560
1561         /* remove all neigh connected to a given path or mcast */
1562         spin_lock_irqsave(&priv->lock, flags);
1563
1564         htbl = rcu_dereference_protected(ntbl->htbl,
1565                                          lockdep_is_held(&priv->lock));
1566
1567         if (!htbl)
1568                 goto out_unlock;
1569
1570         for (i = 0; i < htbl->size; i++) {
1571                 struct ipoib_neigh *neigh;
1572                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1573
1574                 while ((neigh = rcu_dereference_protected(*np,
1575                                                           lockdep_is_held(&priv->lock))) != NULL) {
1576                         /* delete neighs belong to this parent */
1577                         if (!memcmp(gid, neigh->daddr + 4, sizeof (union ib_gid))) {
1578                                 rcu_assign_pointer(*np,
1579                                                    rcu_dereference_protected(neigh->hnext,
1580                                                                              lockdep_is_held(&priv->lock)));
1581                                 /* remove from parent list */
1582                                 list_del_init(&neigh->list);
1583                                 call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1584                         } else {
1585                                 np = &neigh->hnext;
1586                         }
1587
1588                 }
1589         }
1590 out_unlock:
1591         spin_unlock_irqrestore(&priv->lock, flags);
1592 }
1593
1594 static void ipoib_flush_neighs(struct ipoib_dev_priv *priv)
1595 {
1596         struct ipoib_neigh_table *ntbl = &priv->ntbl;
1597         struct ipoib_neigh_hash *htbl;
1598         unsigned long flags;
1599         int i, wait_flushed = 0;
1600
1601         init_completion(&priv->ntbl.flushed);
1602         set_bit(IPOIB_NEIGH_TBL_FLUSH, &priv->flags);
1603
1604         spin_lock_irqsave(&priv->lock, flags);
1605
1606         htbl = rcu_dereference_protected(ntbl->htbl,
1607                                         lockdep_is_held(&priv->lock));
1608         if (!htbl)
1609                 goto out_unlock;
1610
1611         wait_flushed = atomic_read(&priv->ntbl.entries);
1612         if (!wait_flushed)
1613                 goto free_htbl;
1614
1615         for (i = 0; i < htbl->size; i++) {
1616                 struct ipoib_neigh *neigh;
1617                 struct ipoib_neigh __rcu **np = &htbl->buckets[i];
1618
1619                 while ((neigh = rcu_dereference_protected(*np,
1620                                        lockdep_is_held(&priv->lock))) != NULL) {
1621                         rcu_assign_pointer(*np,
1622                                            rcu_dereference_protected(neigh->hnext,
1623                                                                      lockdep_is_held(&priv->lock)));
1624                         /* remove from path/mc list */
1625                         list_del_init(&neigh->list);
1626                         call_rcu(&neigh->rcu, ipoib_neigh_reclaim);
1627                 }
1628         }
1629
1630 free_htbl:
1631         rcu_assign_pointer(ntbl->htbl, NULL);
1632         call_rcu(&htbl->rcu, neigh_hash_free_rcu);
1633
1634 out_unlock:
1635         spin_unlock_irqrestore(&priv->lock, flags);
1636         if (wait_flushed)
1637                 wait_for_completion(&priv->ntbl.flushed);
1638 }
1639
1640 static void ipoib_neigh_hash_uninit(struct net_device *dev)
1641 {
1642         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1643
1644         ipoib_dbg(priv, "%s\n", __func__);
1645         init_completion(&priv->ntbl.deleted);
1646
1647         cancel_delayed_work_sync(&priv->neigh_reap_task);
1648
1649         ipoib_flush_neighs(priv);
1650
1651         wait_for_completion(&priv->ntbl.deleted);
1652 }
1653
1654 static void ipoib_napi_add(struct net_device *dev)
1655 {
1656         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1657
1658         netif_napi_add(dev, &priv->recv_napi, ipoib_rx_poll, IPOIB_NUM_WC);
1659         netif_napi_add(dev, &priv->send_napi, ipoib_tx_poll, MAX_SEND_CQE);
1660 }
1661
1662 static void ipoib_napi_del(struct net_device *dev)
1663 {
1664         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1665
1666         netif_napi_del(&priv->recv_napi);
1667         netif_napi_del(&priv->send_napi);
1668 }
1669
1670 static void ipoib_dev_uninit_default(struct net_device *dev)
1671 {
1672         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1673
1674         ipoib_transport_dev_cleanup(dev);
1675
1676         ipoib_napi_del(dev);
1677
1678         ipoib_cm_dev_cleanup(dev);
1679
1680         kfree(priv->rx_ring);
1681         vfree(priv->tx_ring);
1682
1683         priv->rx_ring = NULL;
1684         priv->tx_ring = NULL;
1685 }
1686
1687 static int ipoib_dev_init_default(struct net_device *dev)
1688 {
1689         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1690
1691         ipoib_napi_add(dev);
1692
1693         /* Allocate RX/TX "rings" to hold queued skbs */
1694         priv->rx_ring = kcalloc(ipoib_recvq_size,
1695                                        sizeof(*priv->rx_ring),
1696                                        GFP_KERNEL);
1697         if (!priv->rx_ring)
1698                 goto out;
1699
1700         priv->tx_ring = vzalloc(array_size(ipoib_sendq_size,
1701                                            sizeof(*priv->tx_ring)));
1702         if (!priv->tx_ring) {
1703                 pr_warn("%s: failed to allocate TX ring (%d entries)\n",
1704                         priv->ca->name, ipoib_sendq_size);
1705                 goto out_rx_ring_cleanup;
1706         }
1707
1708         /* priv->tx_head, tx_tail & tx_outstanding are already 0 */
1709
1710         if (ipoib_transport_dev_init(dev, priv->ca)) {
1711                 pr_warn("%s: ipoib_transport_dev_init failed\n",
1712                         priv->ca->name);
1713                 goto out_tx_ring_cleanup;
1714         }
1715
1716         /* after qp created set dev address */
1717         priv->dev->dev_addr[1] = (priv->qp->qp_num >> 16) & 0xff;
1718         priv->dev->dev_addr[2] = (priv->qp->qp_num >>  8) & 0xff;
1719         priv->dev->dev_addr[3] = (priv->qp->qp_num) & 0xff;
1720
1721         return 0;
1722
1723 out_tx_ring_cleanup:
1724         vfree(priv->tx_ring);
1725
1726 out_rx_ring_cleanup:
1727         kfree(priv->rx_ring);
1728
1729 out:
1730         ipoib_napi_del(dev);
1731         return -ENOMEM;
1732 }
1733
1734 static int ipoib_ioctl(struct net_device *dev, struct ifreq *ifr,
1735                        int cmd)
1736 {
1737         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1738
1739         if (!priv->rn_ops->ndo_do_ioctl)
1740                 return -EOPNOTSUPP;
1741
1742         return priv->rn_ops->ndo_do_ioctl(dev, ifr, cmd);
1743 }
1744
1745 static int ipoib_dev_init(struct net_device *dev)
1746 {
1747         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1748         int ret = -ENOMEM;
1749
1750         priv->qp = NULL;
1751
1752         /*
1753          * the various IPoIB tasks assume they will never race against
1754          * themselves, so always use a single thread workqueue
1755          */
1756         priv->wq = alloc_ordered_workqueue("ipoib_wq", WQ_MEM_RECLAIM);
1757         if (!priv->wq) {
1758                 pr_warn("%s: failed to allocate device WQ\n", dev->name);
1759                 goto out;
1760         }
1761
1762         /* create pd, which used both for control and datapath*/
1763         priv->pd = ib_alloc_pd(priv->ca, 0);
1764         if (IS_ERR(priv->pd)) {
1765                 pr_warn("%s: failed to allocate PD\n", priv->ca->name);
1766                 goto clean_wq;
1767         }
1768
1769         ret = priv->rn_ops->ndo_init(dev);
1770         if (ret) {
1771                 pr_warn("%s failed to init HW resource\n", dev->name);
1772                 goto out_free_pd;
1773         }
1774
1775         ret = ipoib_neigh_hash_init(priv);
1776         if (ret) {
1777                 pr_warn("%s failed to init neigh hash\n", dev->name);
1778                 goto out_dev_uninit;
1779         }
1780
1781         if (dev->flags & IFF_UP) {
1782                 if (ipoib_ib_dev_open(dev)) {
1783                         pr_warn("%s failed to open device\n", dev->name);
1784                         ret = -ENODEV;
1785                         goto out_hash_uninit;
1786                 }
1787         }
1788
1789         return 0;
1790
1791 out_hash_uninit:
1792         ipoib_neigh_hash_uninit(dev);
1793
1794 out_dev_uninit:
1795         ipoib_ib_dev_cleanup(dev);
1796
1797 out_free_pd:
1798         if (priv->pd) {
1799                 ib_dealloc_pd(priv->pd);
1800                 priv->pd = NULL;
1801         }
1802
1803 clean_wq:
1804         if (priv->wq) {
1805                 destroy_workqueue(priv->wq);
1806                 priv->wq = NULL;
1807         }
1808
1809 out:
1810         return ret;
1811 }
1812
1813 /*
1814  * This must be called before doing an unregister_netdev on a parent device to
1815  * shutdown the IB event handler.
1816  */
1817 static void ipoib_parent_unregister_pre(struct net_device *ndev)
1818 {
1819         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1820
1821         /*
1822          * ipoib_set_mac checks netif_running before pushing work, clearing
1823          * running ensures the it will not add more work.
1824          */
1825         rtnl_lock();
1826         dev_change_flags(priv->dev, priv->dev->flags & ~IFF_UP, NULL);
1827         rtnl_unlock();
1828
1829         /* ipoib_event() cannot be running once this returns */
1830         ib_unregister_event_handler(&priv->event_handler);
1831
1832         /*
1833          * Work on the queue grabs the rtnl lock, so this cannot be done while
1834          * also holding it.
1835          */
1836         flush_workqueue(ipoib_workqueue);
1837 }
1838
1839 static void ipoib_set_dev_features(struct ipoib_dev_priv *priv)
1840 {
1841         priv->hca_caps = priv->ca->attrs.device_cap_flags;
1842
1843         if (priv->hca_caps & IB_DEVICE_UD_IP_CSUM) {
1844                 priv->dev->hw_features |= NETIF_F_IP_CSUM | NETIF_F_RXCSUM;
1845
1846                 if (priv->hca_caps & IB_DEVICE_UD_TSO)
1847                         priv->dev->hw_features |= NETIF_F_TSO;
1848
1849                 priv->dev->features |= priv->dev->hw_features;
1850         }
1851 }
1852
1853 static int ipoib_parent_init(struct net_device *ndev)
1854 {
1855         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1856         struct ib_port_attr attr;
1857         int result;
1858
1859         result = ib_query_port(priv->ca, priv->port, &attr);
1860         if (result) {
1861                 pr_warn("%s: ib_query_port %d failed\n", priv->ca->name,
1862                         priv->port);
1863                 return result;
1864         }
1865         priv->max_ib_mtu = ib_mtu_enum_to_int(attr.max_mtu);
1866
1867         result = ib_query_pkey(priv->ca, priv->port, 0, &priv->pkey);
1868         if (result) {
1869                 pr_warn("%s: ib_query_pkey port %d failed (ret = %d)\n",
1870                         priv->ca->name, priv->port, result);
1871                 return result;
1872         }
1873
1874         result = rdma_query_gid(priv->ca, priv->port, 0, &priv->local_gid);
1875         if (result) {
1876                 pr_warn("%s: rdma_query_gid port %d failed (ret = %d)\n",
1877                         priv->ca->name, priv->port, result);
1878                 return result;
1879         }
1880         memcpy(priv->dev->dev_addr + 4, priv->local_gid.raw,
1881                sizeof(union ib_gid));
1882
1883         SET_NETDEV_DEV(priv->dev, priv->ca->dev.parent);
1884         priv->dev->dev_port = priv->port - 1;
1885         /* Let's set this one too for backwards compatibility. */
1886         priv->dev->dev_id = priv->port - 1;
1887
1888         return 0;
1889 }
1890
1891 static void ipoib_child_init(struct net_device *ndev)
1892 {
1893         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1894         struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1895
1896         priv->max_ib_mtu = ppriv->max_ib_mtu;
1897         set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
1898         memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
1899         memcpy(&priv->local_gid, &ppriv->local_gid, sizeof(priv->local_gid));
1900 }
1901
1902 static int ipoib_ndo_init(struct net_device *ndev)
1903 {
1904         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
1905         int rc;
1906
1907         if (priv->parent) {
1908                 ipoib_child_init(ndev);
1909         } else {
1910                 rc = ipoib_parent_init(ndev);
1911                 if (rc)
1912                         return rc;
1913         }
1914
1915         /* MTU will be reset when mcast join happens */
1916         ndev->mtu = IPOIB_UD_MTU(priv->max_ib_mtu);
1917         priv->mcast_mtu = priv->admin_mtu = ndev->mtu;
1918         ndev->max_mtu = IPOIB_CM_MTU;
1919
1920         ndev->neigh_priv_len = sizeof(struct ipoib_neigh);
1921
1922         /*
1923          * Set the full membership bit, so that we join the right
1924          * broadcast group, etc.
1925          */
1926         priv->pkey |= 0x8000;
1927
1928         ndev->broadcast[8] = priv->pkey >> 8;
1929         ndev->broadcast[9] = priv->pkey & 0xff;
1930         set_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
1931
1932         ipoib_set_dev_features(priv);
1933
1934         rc = ipoib_dev_init(ndev);
1935         if (rc) {
1936                 pr_warn("%s: failed to initialize device: %s port %d (ret = %d)\n",
1937                         priv->ca->name, priv->dev->name, priv->port, rc);
1938                 return rc;
1939         }
1940
1941         if (priv->parent) {
1942                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1943
1944                 dev_hold(priv->parent);
1945
1946                 down_write(&ppriv->vlan_rwsem);
1947                 list_add_tail(&priv->list, &ppriv->child_intfs);
1948                 up_write(&ppriv->vlan_rwsem);
1949         }
1950
1951         return 0;
1952 }
1953
1954 static void ipoib_ndo_uninit(struct net_device *dev)
1955 {
1956         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1957
1958         ASSERT_RTNL();
1959
1960         /*
1961          * ipoib_remove_one guarantees the children are removed before the
1962          * parent, and that is the only place where a parent can be removed.
1963          */
1964         WARN_ON(!list_empty(&priv->child_intfs));
1965
1966         if (priv->parent) {
1967                 struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
1968
1969                 down_write(&ppriv->vlan_rwsem);
1970                 list_del(&priv->list);
1971                 up_write(&ppriv->vlan_rwsem);
1972         }
1973
1974         ipoib_neigh_hash_uninit(dev);
1975
1976         ipoib_ib_dev_cleanup(dev);
1977
1978         /* no more works over the priv->wq */
1979         if (priv->wq) {
1980                 flush_workqueue(priv->wq);
1981                 destroy_workqueue(priv->wq);
1982                 priv->wq = NULL;
1983         }
1984
1985         if (priv->parent)
1986                 dev_put(priv->parent);
1987 }
1988
1989 static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)
1990 {
1991         struct ipoib_dev_priv *priv = ipoib_priv(dev);
1992
1993         return ib_set_vf_link_state(priv->ca, vf, priv->port, link_state);
1994 }
1995
1996 static int ipoib_get_vf_config(struct net_device *dev, int vf,
1997                                struct ifla_vf_info *ivf)
1998 {
1999         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2000         int err;
2001
2002         err = ib_get_vf_config(priv->ca, vf, priv->port, ivf);
2003         if (err)
2004                 return err;
2005
2006         ivf->vf = vf;
2007         memcpy(ivf->mac, dev->dev_addr, dev->addr_len);
2008
2009         return 0;
2010 }
2011
2012 static int ipoib_set_vf_guid(struct net_device *dev, int vf, u64 guid, int type)
2013 {
2014         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2015
2016         if (type != IFLA_VF_IB_NODE_GUID && type != IFLA_VF_IB_PORT_GUID)
2017                 return -EINVAL;
2018
2019         return ib_set_vf_guid(priv->ca, vf, priv->port, guid, type);
2020 }
2021
2022 static int ipoib_get_vf_stats(struct net_device *dev, int vf,
2023                               struct ifla_vf_stats *vf_stats)
2024 {
2025         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2026
2027         return ib_get_vf_stats(priv->ca, vf, priv->port, vf_stats);
2028 }
2029
2030 static const struct header_ops ipoib_header_ops = {
2031         .create = ipoib_hard_header,
2032 };
2033
2034 static const struct net_device_ops ipoib_netdev_ops_pf = {
2035         .ndo_init                = ipoib_ndo_init,
2036         .ndo_uninit              = ipoib_ndo_uninit,
2037         .ndo_open                = ipoib_open,
2038         .ndo_stop                = ipoib_stop,
2039         .ndo_change_mtu          = ipoib_change_mtu,
2040         .ndo_fix_features        = ipoib_fix_features,
2041         .ndo_start_xmit          = ipoib_start_xmit,
2042         .ndo_tx_timeout          = ipoib_timeout,
2043         .ndo_set_rx_mode         = ipoib_set_mcast_list,
2044         .ndo_get_iflink          = ipoib_get_iflink,
2045         .ndo_set_vf_link_state   = ipoib_set_vf_link_state,
2046         .ndo_get_vf_config       = ipoib_get_vf_config,
2047         .ndo_get_vf_stats        = ipoib_get_vf_stats,
2048         .ndo_set_vf_guid         = ipoib_set_vf_guid,
2049         .ndo_set_mac_address     = ipoib_set_mac,
2050         .ndo_get_stats64         = ipoib_get_stats,
2051         .ndo_do_ioctl            = ipoib_ioctl,
2052 };
2053
2054 static const struct net_device_ops ipoib_netdev_ops_vf = {
2055         .ndo_init                = ipoib_ndo_init,
2056         .ndo_uninit              = ipoib_ndo_uninit,
2057         .ndo_open                = ipoib_open,
2058         .ndo_stop                = ipoib_stop,
2059         .ndo_change_mtu          = ipoib_change_mtu,
2060         .ndo_fix_features        = ipoib_fix_features,
2061         .ndo_start_xmit          = ipoib_start_xmit,
2062         .ndo_tx_timeout          = ipoib_timeout,
2063         .ndo_set_rx_mode         = ipoib_set_mcast_list,
2064         .ndo_get_iflink          = ipoib_get_iflink,
2065         .ndo_get_stats64         = ipoib_get_stats,
2066         .ndo_do_ioctl            = ipoib_ioctl,
2067 };
2068
2069 void ipoib_setup_common(struct net_device *dev)
2070 {
2071         dev->header_ops          = &ipoib_header_ops;
2072
2073         ipoib_set_ethtool_ops(dev);
2074
2075         dev->watchdog_timeo      = HZ;
2076
2077         dev->flags              |= IFF_BROADCAST | IFF_MULTICAST;
2078
2079         dev->hard_header_len     = IPOIB_HARD_LEN;
2080         dev->addr_len            = INFINIBAND_ALEN;
2081         dev->type                = ARPHRD_INFINIBAND;
2082         dev->tx_queue_len        = ipoib_sendq_size * 2;
2083         dev->features            = (NETIF_F_VLAN_CHALLENGED     |
2084                                     NETIF_F_HIGHDMA);
2085         netif_keep_dst(dev);
2086
2087         memcpy(dev->broadcast, ipv4_bcast_addr, INFINIBAND_ALEN);
2088
2089         /*
2090          * unregister_netdev always frees the netdev, we use this mode
2091          * consistently to unify all the various unregister paths, including
2092          * those connected to rtnl_link_ops which require it.
2093          */
2094         dev->needs_free_netdev = true;
2095 }
2096
2097 static void ipoib_build_priv(struct net_device *dev)
2098 {
2099         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2100
2101         priv->dev = dev;
2102         spin_lock_init(&priv->lock);
2103         init_rwsem(&priv->vlan_rwsem);
2104         mutex_init(&priv->mcast_mutex);
2105
2106         INIT_LIST_HEAD(&priv->path_list);
2107         INIT_LIST_HEAD(&priv->child_intfs);
2108         INIT_LIST_HEAD(&priv->dead_ahs);
2109         INIT_LIST_HEAD(&priv->multicast_list);
2110
2111         INIT_DELAYED_WORK(&priv->mcast_task,   ipoib_mcast_join_task);
2112         INIT_WORK(&priv->carrier_on_task, ipoib_mcast_carrier_on_task);
2113         INIT_WORK(&priv->flush_light,   ipoib_ib_dev_flush_light);
2114         INIT_WORK(&priv->flush_normal,   ipoib_ib_dev_flush_normal);
2115         INIT_WORK(&priv->flush_heavy,   ipoib_ib_dev_flush_heavy);
2116         INIT_WORK(&priv->restart_task, ipoib_mcast_restart_task);
2117         INIT_DELAYED_WORK(&priv->ah_reap_task, ipoib_reap_ah);
2118         INIT_DELAYED_WORK(&priv->neigh_reap_task, ipoib_reap_neigh);
2119 }
2120
2121 static const struct net_device_ops ipoib_netdev_default_pf = {
2122         .ndo_init                = ipoib_dev_init_default,
2123         .ndo_uninit              = ipoib_dev_uninit_default,
2124         .ndo_open                = ipoib_ib_dev_open_default,
2125         .ndo_stop                = ipoib_ib_dev_stop_default,
2126 };
2127
2128 static struct net_device *ipoib_alloc_netdev(struct ib_device *hca, u8 port,
2129                                              const char *name)
2130 {
2131         struct net_device *dev;
2132
2133         dev = rdma_alloc_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2134                                 NET_NAME_UNKNOWN, ipoib_setup_common);
2135         if (!IS_ERR(dev) || PTR_ERR(dev) != -EOPNOTSUPP)
2136                 return dev;
2137
2138         dev = alloc_netdev(sizeof(struct rdma_netdev), name, NET_NAME_UNKNOWN,
2139                            ipoib_setup_common);
2140         if (!dev)
2141                 return ERR_PTR(-ENOMEM);
2142         return dev;
2143 }
2144
2145 int ipoib_intf_init(struct ib_device *hca, u8 port, const char *name,
2146                     struct net_device *dev)
2147 {
2148         struct rdma_netdev *rn = netdev_priv(dev);
2149         struct ipoib_dev_priv *priv;
2150         int rc;
2151
2152         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
2153         if (!priv)
2154                 return -ENOMEM;
2155
2156         priv->ca = hca;
2157         priv->port = port;
2158
2159         rc = rdma_init_netdev(hca, port, RDMA_NETDEV_IPOIB, name,
2160                               NET_NAME_UNKNOWN, ipoib_setup_common, dev);
2161         if (rc) {
2162                 if (rc != -EOPNOTSUPP)
2163                         goto out;
2164
2165                 dev->netdev_ops = &ipoib_netdev_default_pf;
2166                 rn->send = ipoib_send;
2167                 rn->attach_mcast = ipoib_mcast_attach;
2168                 rn->detach_mcast = ipoib_mcast_detach;
2169                 rn->hca = hca;
2170         }
2171
2172         priv->rn_ops = dev->netdev_ops;
2173
2174         if (hca->attrs.device_cap_flags & IB_DEVICE_VIRTUAL_FUNCTION)
2175                 dev->netdev_ops = &ipoib_netdev_ops_vf;
2176         else
2177                 dev->netdev_ops = &ipoib_netdev_ops_pf;
2178
2179         rn->clnt_priv = priv;
2180         /*
2181          * Only the child register_netdev flows can handle priv_destructor
2182          * being set, so we force it to NULL here and handle manually until it
2183          * is safe to turn on.
2184          */
2185         priv->next_priv_destructor = dev->priv_destructor;
2186         dev->priv_destructor = NULL;
2187
2188         ipoib_build_priv(dev);
2189
2190         return 0;
2191
2192 out:
2193         kfree(priv);
2194         return rc;
2195 }
2196
2197 struct net_device *ipoib_intf_alloc(struct ib_device *hca, u8 port,
2198                                     const char *name)
2199 {
2200         struct net_device *dev;
2201         int rc;
2202
2203         dev = ipoib_alloc_netdev(hca, port, name);
2204         if (IS_ERR(dev))
2205                 return dev;
2206
2207         rc = ipoib_intf_init(hca, port, name, dev);
2208         if (rc) {
2209                 free_netdev(dev);
2210                 return ERR_PTR(rc);
2211         }
2212
2213         /*
2214          * Upon success the caller must ensure ipoib_intf_free is called or
2215          * register_netdevice succeed'd and priv_destructor is set to
2216          * ipoib_intf_free.
2217          */
2218         return dev;
2219 }
2220
2221 void ipoib_intf_free(struct net_device *dev)
2222 {
2223         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2224         struct rdma_netdev *rn = netdev_priv(dev);
2225
2226         dev->priv_destructor = priv->next_priv_destructor;
2227         if (dev->priv_destructor)
2228                 dev->priv_destructor(dev);
2229
2230         /*
2231          * There are some error flows around register_netdev failing that may
2232          * attempt to call priv_destructor twice, prevent that from happening.
2233          */
2234         dev->priv_destructor = NULL;
2235
2236         /* unregister/destroy is very complicated. Make bugs more obvious. */
2237         rn->clnt_priv = NULL;
2238
2239         kfree(priv);
2240 }
2241
2242 static ssize_t show_pkey(struct device *dev,
2243                          struct device_attribute *attr, char *buf)
2244 {
2245         struct net_device *ndev = to_net_dev(dev);
2246         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2247
2248         return sprintf(buf, "0x%04x\n", priv->pkey);
2249 }
2250 static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
2251
2252 static ssize_t show_umcast(struct device *dev,
2253                            struct device_attribute *attr, char *buf)
2254 {
2255         struct net_device *ndev = to_net_dev(dev);
2256         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2257
2258         return sprintf(buf, "%d\n", test_bit(IPOIB_FLAG_UMCAST, &priv->flags));
2259 }
2260
2261 void ipoib_set_umcast(struct net_device *ndev, int umcast_val)
2262 {
2263         struct ipoib_dev_priv *priv = ipoib_priv(ndev);
2264
2265         if (umcast_val > 0) {
2266                 set_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2267                 ipoib_warn(priv, "ignoring multicast groups joined directly "
2268                                 "by userspace\n");
2269         } else
2270                 clear_bit(IPOIB_FLAG_UMCAST, &priv->flags);
2271 }
2272
2273 static ssize_t set_umcast(struct device *dev,
2274                           struct device_attribute *attr,
2275                           const char *buf, size_t count)
2276 {
2277         unsigned long umcast_val = simple_strtoul(buf, NULL, 0);
2278
2279         ipoib_set_umcast(to_net_dev(dev), umcast_val);
2280
2281         return count;
2282 }
2283 static DEVICE_ATTR(umcast, S_IWUSR | S_IRUGO, show_umcast, set_umcast);
2284
2285 int ipoib_add_umcast_attr(struct net_device *dev)
2286 {
2287         return device_create_file(&dev->dev, &dev_attr_umcast);
2288 }
2289
2290 static void set_base_guid(struct ipoib_dev_priv *priv, union ib_gid *gid)
2291 {
2292         struct ipoib_dev_priv *child_priv;
2293         struct net_device *netdev = priv->dev;
2294
2295         netif_addr_lock_bh(netdev);
2296
2297         memcpy(&priv->local_gid.global.interface_id,
2298                &gid->global.interface_id,
2299                sizeof(gid->global.interface_id));
2300         memcpy(netdev->dev_addr + 4, &priv->local_gid, sizeof(priv->local_gid));
2301         clear_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags);
2302
2303         netif_addr_unlock_bh(netdev);
2304
2305         if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags)) {
2306                 down_read(&priv->vlan_rwsem);
2307                 list_for_each_entry(child_priv, &priv->child_intfs, list)
2308                         set_base_guid(child_priv, gid);
2309                 up_read(&priv->vlan_rwsem);
2310         }
2311 }
2312
2313 static int ipoib_check_lladdr(struct net_device *dev,
2314                               struct sockaddr_storage *ss)
2315 {
2316         union ib_gid *gid = (union ib_gid *)(ss->__data + 4);
2317         int ret = 0;
2318
2319         netif_addr_lock_bh(dev);
2320
2321         /* Make sure the QPN, reserved and subnet prefix match the current
2322          * lladdr, it also makes sure the lladdr is unicast.
2323          */
2324         if (memcmp(dev->dev_addr, ss->__data,
2325                    4 + sizeof(gid->global.subnet_prefix)) ||
2326             gid->global.interface_id == 0)
2327                 ret = -EINVAL;
2328
2329         netif_addr_unlock_bh(dev);
2330
2331         return ret;
2332 }
2333
2334 static int ipoib_set_mac(struct net_device *dev, void *addr)
2335 {
2336         struct ipoib_dev_priv *priv = ipoib_priv(dev);
2337         struct sockaddr_storage *ss = addr;
2338         int ret;
2339
2340         if (!(dev->priv_flags & IFF_LIVE_ADDR_CHANGE) && netif_running(dev))
2341                 return -EBUSY;
2342
2343         ret = ipoib_check_lladdr(dev, ss);
2344         if (ret)
2345                 return ret;
2346
2347         set_base_guid(priv, (union ib_gid *)(ss->__data + 4));
2348
2349         queue_work(ipoib_workqueue, &priv->flush_light);
2350
2351         return 0;
2352 }
2353
2354 static ssize_t create_child(struct device *dev,
2355                             struct device_attribute *attr,
2356                             const char *buf, size_t count)
2357 {
2358         int pkey;
2359         int ret;
2360
2361         if (sscanf(buf, "%i", &pkey) != 1)
2362                 return -EINVAL;
2363
2364         if (pkey <= 0 || pkey > 0xffff || pkey == 0x8000)
2365                 return -EINVAL;
2366
2367         ret = ipoib_vlan_add(to_net_dev(dev), pkey);
2368
2369         return ret ? ret : count;
2370 }
2371 static DEVICE_ATTR(create_child, S_IWUSR, NULL, create_child);
2372
2373 static ssize_t delete_child(struct device *dev,
2374                             struct device_attribute *attr,
2375                             const char *buf, size_t count)
2376 {
2377         int pkey;
2378         int ret;
2379
2380         if (sscanf(buf, "%i", &pkey) != 1)
2381                 return -EINVAL;
2382
2383         if (pkey < 0 || pkey > 0xffff)
2384                 return -EINVAL;
2385
2386         ret = ipoib_vlan_delete(to_net_dev(dev), pkey);
2387
2388         return ret ? ret : count;
2389
2390 }
2391 static DEVICE_ATTR(delete_child, S_IWUSR, NULL, delete_child);
2392
2393 int ipoib_add_pkey_attr(struct net_device *dev)
2394 {
2395         return device_create_file(&dev->dev, &dev_attr_pkey);
2396 }
2397
2398 /*
2399  * We erroneously exposed the iface's port number in the dev_id
2400  * sysfs field long after dev_port was introduced for that purpose[1],
2401  * and we need to stop everyone from relying on that.
2402  * Let's overload the shower routine for the dev_id file here
2403  * to gently bring the issue up.
2404  *
2405  * [1] https://www.spinics.net/lists/netdev/msg272123.html
2406  */
2407 static ssize_t dev_id_show(struct device *dev,
2408                            struct device_attribute *attr, char *buf)
2409 {
2410         struct net_device *ndev = to_net_dev(dev);
2411
2412         /*
2413          * ndev->dev_port will be equal to 0 in old kernel prior to commit
2414          * 9b8b2a323008 ("IB/ipoib: Use dev_port to expose network interface
2415          * port numbers") Zero was chosen as special case for user space
2416          * applications to fallback and query dev_id to check if it has
2417          * different value or not.
2418          *
2419          * Don't print warning in such scenario.
2420          *
2421          * https://github.com/systemd/systemd/blob/master/src/udev/udev-builtin-net_id.c#L358
2422          */
2423         if (ndev->dev_port && ndev->dev_id == ndev->dev_port)
2424                 netdev_info_once(ndev,
2425                         "\"%s\" wants to know my dev_id. Should it look at dev_port instead? See Documentation/ABI/testing/sysfs-class-net for more info.\n",
2426                         current->comm);
2427
2428         return sprintf(buf, "%#x\n", ndev->dev_id);
2429 }
2430 static DEVICE_ATTR_RO(dev_id);
2431
2432 static int ipoib_intercept_dev_id_attr(struct net_device *dev)
2433 {
2434         device_remove_file(&dev->dev, &dev_attr_dev_id);
2435         return device_create_file(&dev->dev, &dev_attr_dev_id);
2436 }
2437
2438 static struct net_device *ipoib_add_port(const char *format,
2439                                          struct ib_device *hca, u8 port)
2440 {
2441         struct rtnl_link_ops *ops = ipoib_get_link_ops();
2442         struct rdma_netdev_alloc_params params;
2443         struct ipoib_dev_priv *priv;
2444         struct net_device *ndev;
2445         int result;
2446
2447         ndev = ipoib_intf_alloc(hca, port, format);
2448         if (IS_ERR(ndev)) {
2449                 pr_warn("%s, %d: ipoib_intf_alloc failed %ld\n", hca->name, port,
2450                         PTR_ERR(ndev));
2451                 return ndev;
2452         }
2453         priv = ipoib_priv(ndev);
2454
2455         INIT_IB_EVENT_HANDLER(&priv->event_handler,
2456                               priv->ca, ipoib_event);
2457         ib_register_event_handler(&priv->event_handler);
2458
2459         /* call event handler to ensure pkey in sync */
2460         queue_work(ipoib_workqueue, &priv->flush_heavy);
2461
2462         result = register_netdev(ndev);
2463         if (result) {
2464                 pr_warn("%s: couldn't register ipoib port %d; error %d\n",
2465                         hca->name, port, result);
2466
2467                 ipoib_parent_unregister_pre(ndev);
2468                 ipoib_intf_free(ndev);
2469                 free_netdev(ndev);
2470
2471                 return ERR_PTR(result);
2472         }
2473
2474         if (hca->ops.rdma_netdev_get_params) {
2475                 int rc = hca->ops.rdma_netdev_get_params(hca, port,
2476                                                      RDMA_NETDEV_IPOIB,
2477                                                      &params);
2478
2479                 if (!rc && ops->priv_size < params.sizeof_priv)
2480                         ops->priv_size = params.sizeof_priv;
2481         }
2482         /*
2483          * We cannot set priv_destructor before register_netdev because we
2484          * need priv to be always valid during the error flow to execute
2485          * ipoib_parent_unregister_pre(). Instead handle it manually and only
2486          * enter priv_destructor mode once we are completely registered.
2487          */
2488         ndev->priv_destructor = ipoib_intf_free;
2489
2490         if (ipoib_intercept_dev_id_attr(ndev))
2491                 goto sysfs_failed;
2492         if (ipoib_cm_add_mode_attr(ndev))
2493                 goto sysfs_failed;
2494         if (ipoib_add_pkey_attr(ndev))
2495                 goto sysfs_failed;
2496         if (ipoib_add_umcast_attr(ndev))
2497                 goto sysfs_failed;
2498         if (device_create_file(&ndev->dev, &dev_attr_create_child))
2499                 goto sysfs_failed;
2500         if (device_create_file(&ndev->dev, &dev_attr_delete_child))
2501                 goto sysfs_failed;
2502
2503         return ndev;
2504
2505 sysfs_failed:
2506         ipoib_parent_unregister_pre(ndev);
2507         unregister_netdev(ndev);
2508         return ERR_PTR(-ENOMEM);
2509 }
2510
2511 static void ipoib_add_one(struct ib_device *device)
2512 {
2513         struct list_head *dev_list;
2514         struct net_device *dev;
2515         struct ipoib_dev_priv *priv;
2516         unsigned int p;
2517         int count = 0;
2518
2519         dev_list = kmalloc(sizeof(*dev_list), GFP_KERNEL);
2520         if (!dev_list)
2521                 return;
2522
2523         INIT_LIST_HEAD(dev_list);
2524
2525         rdma_for_each_port (device, p) {
2526                 if (!rdma_protocol_ib(device, p))
2527                         continue;
2528                 dev = ipoib_add_port("ib%d", device, p);
2529                 if (!IS_ERR(dev)) {
2530                         priv = ipoib_priv(dev);
2531                         list_add_tail(&priv->list, dev_list);
2532                         count++;
2533                 }
2534         }
2535
2536         if (!count) {
2537                 kfree(dev_list);
2538                 return;
2539         }
2540
2541         ib_set_client_data(device, &ipoib_client, dev_list);
2542 }
2543
2544 static void ipoib_remove_one(struct ib_device *device, void *client_data)
2545 {
2546         struct ipoib_dev_priv *priv, *tmp, *cpriv, *tcpriv;
2547         struct list_head *dev_list = client_data;
2548
2549         if (!dev_list)
2550                 return;
2551
2552         list_for_each_entry_safe(priv, tmp, dev_list, list) {
2553                 LIST_HEAD(head);
2554                 ipoib_parent_unregister_pre(priv->dev);
2555
2556                 rtnl_lock();
2557
2558                 list_for_each_entry_safe(cpriv, tcpriv, &priv->child_intfs,
2559                                          list)
2560                         unregister_netdevice_queue(cpriv->dev, &head);
2561                 unregister_netdevice_queue(priv->dev, &head);
2562                 unregister_netdevice_many(&head);
2563
2564                 rtnl_unlock();
2565         }
2566
2567         kfree(dev_list);
2568 }
2569
2570 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2571 static struct notifier_block ipoib_netdev_notifier = {
2572         .notifier_call = ipoib_netdev_event,
2573 };
2574 #endif
2575
2576 static int __init ipoib_init_module(void)
2577 {
2578         int ret;
2579
2580         ipoib_recvq_size = roundup_pow_of_two(ipoib_recvq_size);
2581         ipoib_recvq_size = min(ipoib_recvq_size, IPOIB_MAX_QUEUE_SIZE);
2582         ipoib_recvq_size = max(ipoib_recvq_size, IPOIB_MIN_QUEUE_SIZE);
2583
2584         ipoib_sendq_size = roundup_pow_of_two(ipoib_sendq_size);
2585         ipoib_sendq_size = min(ipoib_sendq_size, IPOIB_MAX_QUEUE_SIZE);
2586         ipoib_sendq_size = max3(ipoib_sendq_size, 2 * MAX_SEND_CQE, IPOIB_MIN_QUEUE_SIZE);
2587 #ifdef CONFIG_INFINIBAND_IPOIB_CM
2588         ipoib_max_conn_qp = min(ipoib_max_conn_qp, IPOIB_CM_MAX_CONN_QP);
2589         ipoib_max_conn_qp = max(ipoib_max_conn_qp, 0);
2590 #endif
2591
2592         /*
2593          * When copying small received packets, we only copy from the
2594          * linear data part of the SKB, so we rely on this condition.
2595          */
2596         BUILD_BUG_ON(IPOIB_CM_COPYBREAK > IPOIB_CM_HEAD_SIZE);
2597
2598         ipoib_register_debugfs();
2599
2600         /*
2601          * We create a global workqueue here that is used for all flush
2602          * operations.  However, if you attempt to flush a workqueue
2603          * from a task on that same workqueue, it deadlocks the system.
2604          * We want to be able to flush the tasks associated with a
2605          * specific net device, so we also create a workqueue for each
2606          * netdevice.  We queue up the tasks for that device only on
2607          * its private workqueue, and we only queue up flush events
2608          * on our global flush workqueue.  This avoids the deadlocks.
2609          */
2610         ipoib_workqueue = alloc_ordered_workqueue("ipoib_flush", 0);
2611         if (!ipoib_workqueue) {
2612                 ret = -ENOMEM;
2613                 goto err_fs;
2614         }
2615
2616         ib_sa_register_client(&ipoib_sa_client);
2617
2618         ret = ib_register_client(&ipoib_client);
2619         if (ret)
2620                 goto err_sa;
2621
2622         ret = ipoib_netlink_init();
2623         if (ret)
2624                 goto err_client;
2625
2626 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2627         register_netdevice_notifier(&ipoib_netdev_notifier);
2628 #endif
2629         return 0;
2630
2631 err_client:
2632         ib_unregister_client(&ipoib_client);
2633
2634 err_sa:
2635         ib_sa_unregister_client(&ipoib_sa_client);
2636         destroy_workqueue(ipoib_workqueue);
2637
2638 err_fs:
2639         ipoib_unregister_debugfs();
2640
2641         return ret;
2642 }
2643
2644 static void __exit ipoib_cleanup_module(void)
2645 {
2646 #ifdef CONFIG_INFINIBAND_IPOIB_DEBUG
2647         unregister_netdevice_notifier(&ipoib_netdev_notifier);
2648 #endif
2649         ipoib_netlink_fini();
2650         ib_unregister_client(&ipoib_client);
2651         ib_sa_unregister_client(&ipoib_sa_client);
2652         ipoib_unregister_debugfs();
2653         destroy_workqueue(ipoib_workqueue);
2654 }
2655
2656 module_init(ipoib_init_module);
2657 module_exit(ipoib_cleanup_module);